填入下列句子横线上恰当的一组关联词是社会主义制度的巩固，社会主义事业的发展，只能是两个文明同时建设、相互促进的结果。    两手都硬起来，  能两个文明一起上；单有一手硬，   可能有一时的效果，   最终两个文明都上不去。

I began to work in Beijing in the year____NewChina was founded [ ]

Has John repaired his washing machine—He had it________，because he was so busy.

Where did you find our chemistry teacher? —It was in the lab he was doing his experiment.

He does his homework _____ he gets home.